The article addresses the relationship between the liturgy and Christian life in the perspective of the principle lex orandi – lex vivendi. Contemporary liturgical theology increasingly emphasizes that the liturgy not only expresses the faith of the Church but also shapes the way believers live. The aim of the article is to analyze the formative and educational dimension of the liturgy in the understanding of the Magisterium of the Church, Achille Triacca, and David Fagerberg. The first part presents the teaching of the Church’s Magisterium concerning the formative character of the liturgy, providing the theological background for further reflection. The next section discusses Triacca’s triadic structure mysterium – actio – vita, which presents the liturgy as the space in which the mystery of Christ becomes present and permeates the life of the believer, shaping his moral disposition. The following part presents Fagerberg’s concept, according to which the liturgy constitutes theologia prima, whose natural fruit is liturgical asceticism understood as lex vivendi. A comparison of these two perspectives reveals their complementary character and allows us to indicate how the liturgy fulfills a formative and educational function within the Church. The article therefore shows that both Triacca and Fagerberg develop the intuition of the Magisterium by locating the educational function of the liturgy in the ontological incorporation of the human person into the mystery of Christ, which gradually transforms the way of life of the believer.
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